SecureFile Deduplication and Partition

Dear all,
I try to understand the following statements that are written in the Oracle Database Large Object and SecureFile developer's Guide 11g Rel 2:
- Duplicate detection happens within a LOB segment. For partitioned and
subpartitioned LOB columns duplicate detection does not span partitions or
subpartitions.
- Deduplication can be specified at a partition level. The lob_storage_clause
enables specification for partitioned tables on a per-partition basis.As I understand, the first statement saying that the deduplication cannot detect a duplication among different partition. What is this to do with "duplication detection happens within a LOB segment"?
I understand the second statement saying that deduplication can detect duplication when it occurs in the same partition. Is this correct?
Regards,
Val

LOB segments can be partitioned.
http://www.morganslibrary.org/reference/partitions.html

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